2(4u-5)=70
2(4u)=70-5
2*(4u)=65
(4u)=65/2
4u=32.5
32.5/4=8.125
u=8.125
i think
EDIT: OVER IS WRONG HERE IS CORRECT:
2(4u-5)=70
8u-10=70
8u=70+10
8u=80
80/8=10
u=10
+1491 Nice catch, a simple mistake but remember that parenthesis are impenetrable unless left alone as a term.
+1491 Ah... simple algebra, a time I wish I could return to.
What you want to do first, is distribute that 2 into 4u-5 and get...
8u - 10 = 70
Add ten to both sides:
8u = 80
Divide 8 on both sides:
u = 10
